fail if trying to install max plugin on an unsupported platform

Author: vkovec

Assets/FbxExporters/Editor/InstallIntegration.cs

@@ -439,6 +439,11 @@ private static string GetInstallScript(){
         }
 
         public static int InstallMaxPlugin(){
+            if (Application.platform != RuntimePlatform.WindowsEditor) {
+                Debug.LogError ("The 3DsMax Unity plugin is Windows only, please try installing a Maya plugin instead");
+                return -1;
+            }
+
             var maxExe = GetMaxExe ();
             var installScript = GetInstallScript ();
 
@@ -457,13 +462,8 @@ public static int InstallMaxPlugin(){
                 myProcess.StartInfo.CreateNoWindow = true;
                 myProcess.StartInfo.UseShellExecute = false;
 
-#if UNITY_EDITOR_OSX
-                throw new NotImplementedException();
-#elif UNITY_EDITOR_LINUX
-                throw new NotImplementedException();
-#else // UNITY_EDITOR_WINDOWS
                 myProcess.StartInfo.Arguments = string.Format("-q -silent -mxs \"{0}\"", installScript);
-#endif
+
                 myProcess.EnableRaisingEvents = true;
                 myProcess.Start();
                 myProcess.WaitForExit();